Thompson & Brown (1984) stated, “Details of the reproductive cycle are unknown.” but in January 2015 and August 2017 Chris Rickard photographed specimens and spawn on the encrusting bryozoan, Cellepora pumicosa, on sublittoral, vertical rockfaces, at c. 8 m depth, at Macduff, north-east. Scotland. These may be the first recorded spawn since the species was first described in 1846 by Alder and Hancock.

The small size, low profile, tubercles and pinkish white and brown mantle make A. sparsa difficult to detect against Cellepora pumicosa .

© C. Rickard.